How to Read an Orderbook: Bid, Ask & Market Depth

An orderbook is a live list of all open buy and sell orders for a trading pair. It is the core data structure that determines price on any exchange.

Market depth shows the cumulative volume of orders at each price level. It tells you how much buying or selling pressure exists across the entire orderbook — not just at the best bid/ask.

• Cumulative Size: Each row in the depth chart adds up all orders at that price and below (bids) or above (asks). A steep curve means many orders are concentrated near the current price.
• Depth Chart: The visual representation of bids (left/green) and asks (right/red) as area curves. Where the two curves meet is the current market price.
• Imbalance: If the bid side is significantly thicker than the ask side, there is more buying pressure — and vice versa. This can signal short-term price direction.

A "liquidity wall" is a large cluster of orders at a specific price level that acts as support or resistance.

Orderbook data complements chart analysis. Here's how to use it:

• Entry Timing: Place limit buy orders just above strong bid walls — you get filled near support while the wall absorbs selling pressure.
• Exit Targets: Set take-profit orders just below large ask walls — the price is likely to stall at heavy resistance.
• Slippage Estimation: Check depth before placing large market orders. If the book is thin, use limit orders or TWAP to avoid moving the price against yourself.
• Trend Confirmation: Rising prices with increasing bid depth confirms bullish momentum. Rising prices with thinning bids may signal an exhaustion move.

Large traders ("whales") leave footprints in the orderbook. Learning to spot them gives you an edge:

• Sudden Large Orders: A massive order appearing at a specific level may indicate institutional interest at that price.
• Iceberg Orders: Some whales split large orders into smaller visible portions. If a level keeps getting filled but never shrinks, an iceberg order may be present.
• Rapid Cancellations: Large orders that appear and disappear quickly may be spoofing attempts — treat them with caution.

The best way to learn orderbook reading is hands-on. Open any trading pair on Dexly and study the live orderbook alongside price action.